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Full text of "Metallurgy Of Cast Iron"

I'KKFACK   To    FIFTH    KDITloN.                       XVII
was clue to the hick of skill, on the part of the niolclers and their inexperience in making such round bars on. end. \Vliy does Mr. Keep refer to the Chicago foundrymen's local Association report and not to that of the national body (American Poundrymen's Association), accepted at Buffalo, June 1901, in which IIK-V recommend the use of round bars cast on end, and thai bars should not be smaller than i !;> inches diameter, as recorded on pai^'es 574 to c;,S.j. of this work, and also still persist, in advocating the use of '-j-ineh s<maiv bars with the evidence obtainable to prove their militm.-ss for testing cast iron, (iood evidence of the unfit ness of l-..-iiu.'h square bars is ]>resented by Mr. Krep in his book, k* Cast Iron," pa^'cs 173 and 174. Here we find that a slight difference in the fluidity of the same metal ^ave a difference of a hundred pounds in the- body of two '/-inch square bars a quality *:-.;u'tly in keeping with the evidence presented in this work showing how casilv such small bars are made unreliable by slight variations in. the temper "i" dampness of molding sand and temperature of ponriu;; im'tab
Mr. Keep lias presented tests in his work that were obtained bv the American Koundrymen's Association c'lmmittec, but in so doin^' endeavors (o carry alon^ tests of the r,'-inch bar also. The A. K. A. com-iuittec found tliat a bar as small as '-'"inch square or round was wholly unsuited to test any kind of iron, and hrncr totally ignored it in their recommendation, which was unanimously accepted by tin's national body, as staled above. It is to be iv.tjTetU'd that men of inexpenenee in the actual work of broad molding or founding may be led to adopt incorrect practices,s and chill attached to them. Thisanuary, 1902.eir abbrt*via!i'ir or symbols as generally writtrn by , Is^ini'j^, Thf tables following arc copied from Mes.srs. ("rc-uirr andthods of Casting and Compilation <>i"  Result;1, of Amer-